ContentType doesn't declare an explicit app_label

Question

I am deploying a Django 1.10 project onto an Ubuntu server with Apache and mod_wsgi. I am getting the following 500 error which I can't solve:

RuntimeError: Model class django.contrib.contenttypes.models.ContentType doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

installed_apps in settings.py:

INSTALLED_APPS = [
    'django.contrib.sites',
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'dashboard',
]

wsgi.py:

sys.path.append('/home/x_dashboard/x_dashboard/')

activate_this = os.path.expanduser("/home/x_dashboard/.venv/bin/activate_this.py")
execfile(activate_this, dict(__file__=activate_this))

os.environ['PYTHON_EGG_CACHE'] = '/home/x_dashboard/x_dashboard/.python-egg'
os.environ['DJANGO_SETTINGS_MODULE'] = 'x_dashboard.settings'

import django.core.handlers.wsgi
application = django.core.handlers.wsgi.WSGIHandler()

Apache config:

<VirtualHost *:80>
   #ServerName example.com
   #ServerAlias www.example.com
   #ServerAdmin username@example.com

   DocumentRoot /home/x_dashboard/x_dashboard/

   #ErrorLog /var/www/html/example.com/logs/error.log
   #CustomLog /var/www/html/example.com/logs/access.log combined

   WSGIScriptAlias / /home/x_dashboard/x_dashboard/x_dashboard/wsgi_local.py

   #Alias /robots.txt /var/www/html/example.com/public_html/robots.txt
   #Alias /favicon.ico /var/www/html/example.com/public_html/favicon.ico
   #Alias /images /var/www/html/example.com/public_html/images
   Alias /static /var/www/x_dashboard/static

   <Directory /home/x_dashboard/x_dashboard/x_dashboard/>
     <Files wsgi.py>
     Order deny,allow
     Allow from all
     Require all granted
     </Files>
   </Directory>
</VirtualHost>

The Django documentation says that an app_label is required for models which do not belong to an app defined in installed_apps. However, 'django.contrib.contenttypes' is defined in installed_apps.

Any help appreciated.

Please show the full traceback – Alasdair Mar 15 '17 at 13:52 — Alasdair, Mar 15 '17 at 13:52

score 5 · Answer 1 · edited Jan 07 '21 at 13:18

5

Try running the following commands:

python manage.py makemigrations 
python manage.py migrate

This solved the issue on my side.

edited Jan 07 '21 at 13:18

Adrian Mole

49,934
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answered Jan 07 '21 at 10:34

Kirumosama

51
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What if I don't have any pending migrations? – Henshal B Oct 10 '22 at 10:09

score 2 · Answer 2 · edited May 23 '17 at 12:25

2

For anyone else struggling with this bug: I solved it by moving 'django.contrib.contenttypes', to the top of my installed_apps list in settings.py.

I also moved

import django
django.setup()

to after installed_apps. This thread was helpful.

edited May 23 '17 at 12:25

Community

1
1

answered Mar 15 '17 at 14:00

eli

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2

In my case it was that an app (django-rosetta) listed in INSTALLED_APPS wasn't installed (pip install) in the virtual environment. – Ivan Ogai Jul 28 '19 at 07:24
@eli what is means `import django django.setup()` and where did u implemented it. – Rahul Verma Jul 03 '20 at 23:41

score 1 · Answer 3 · answered Feb 04 '23 at 19:07

1

Just make sure to set up your env var: DJANGO_SETTINGS_MODULE=project_dir.settings.local.

answered Feb 04 '23 at 19:07

Mohammad Mahjoub

417
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12

ContentType doesn't declare an explicit app_label

3 Answers3

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